Tool for piercing billets



L. D. EARL.

TOOL FOR PIERCING BILLETS. APPLICATION FILED MAR.29, 1919.

Patented Apr. 12, 1921.

3V I t 4 UNITED STA ES PATENT; orrics.

LUTHER ID. EARL, OF SHELBY, OHIO.

TOOL FOR PIERCING- BILLETS.

To all whom it may concern.

Be it known that I, LUTHER D. EARL, a citizen of the United States,residing at Shelby, in the county of Richland and State of Ohio, haveinvented a certain new and useful Improvement in Tools forPiercingBillets, of which the following is a full, clear, and exact description,reference'being had to the accompanying drawings.

This invention relates to too s for piercing billets and has forits'general object to provide such tools with points which will increasethe efficiency thereof. More limitedly the object of the invention is toprovide a point having an efficient means for cooling the same; also toprovide a point the shape whereof will facilitate and .promote thepiercing operation. I accomplish the foregoing objects in and throughthe construction shown in the drawings forming part hereof, whereinFigure 1 represents a sectional view through a portion of abilletpiercing tool, the billet with which it cooperates being shown inelevation; and Fig. 2 an enlarged detail in elevation of a portion ofthe point of such tool.

Describing the various parts by reference characters, 1 denotes aportion of a billet, which may be formed into a seamless tube, and 2 ahollow bar or shank forming a part of the tool. At its forward or workfacing end, it is provided with the point which pierces the billet inthe process of forming a tube or other object therefrom. This pointcomprises generally a body member 3 and a detachable point member,indicated at 4%. The rear end of the body member 3 is reduced, as shownat 5, to form a close fit within the frontend of the bar or shank 2, towhich it may be secured as by a pin 5% Intermediate of its ends, themember 3 is enlarged, as shown at 6, the front and rear of suchenlargement providing shoulders, the rear shoulder, indicated at 7forming an abutment for the point proper. Extending forwardly from thefront shoulder is an externally threaded portion 9; in front of of thisthreaded portion there is provided an annular channel, and from thischannel 10 the front portion of the member 8 is tapered orfrusto-conical in shape, as shown at ,11. Grooves 12 extendlongitudinally of the frusto-conical surface, communicating at theirrear ends with the channel 10 and at their front ends with a chamberformed within the point member. From the an- Specification of LettersPatent. Patented Apr, 12, 1921. Application filed March 29, 1919. SerialNo. 286,202.

nular channel, ports 13 extend to a central bore 14 provided within thebody This bore 1s contractedat its forward end in order to form a closefit with a tube 15, whichextends through the hollow bar or shank 2 andentirely through the bore 14: and the reduced front thereof.

The point member, indicated at 4, is generally tapered from rear tofront and is provided at itsfront end with a rounded knob P. The innerwall of the point member is so shaped as to conform to the parts 9 and11 of the body 3, the rear end of the wall being threaded upon theportion 9 of said body. From this internally threaded portion, the innerwall of the point member is tapered or frusto-conical whereby, whenscrewed home upon the body 3, it forms a tight fit with the exteriorsurface of the portion llthereof. In front of the tapered end of saidbody, the point member is provided with a chamber 16 into which thefront end of the tube 15 projects. In operation, a cooling fluid, suchas water, will be supplied through the tube 15 into the chamber 16whence it will flow through the channels provided by the interior of thepoint member and the grooves 12 to the annular groove 10 and thencethrough the ports 18 to the enlarged portion of the bore 1 1 and throughthe interior of the hollow bar or shank 2.

By this arrangement of parts, the. working. end or point of the piercingtool is effectively what I claim is 1. In a tool of the characterdescribed, the combination of a hollow bar or shank, a chambered pointat the forward end of said bar or shank, a fluid supply extending to thechamber of said point, and a plurality of passageways in said pointcommunicating with the chamber and conducting fluid therefrom in coolingrelation to said point.

2. In a tool of the character described, the combination of a barorshank, a connecting body at the forward end of said bar or shank, achambered point detachably mounted on said body, a fluid supplyextending through said body and communicatingwith the chamber ofsaidpoint, and a plurality of passageways in said body communicating withthe chamber and conducting fluid in front of said tube, and passagewayscommunicating with said chamber and extending rearwardlydherefrom andcommunicating with the enlarged portion of said bore.

4. In a tool of-the character described, the combination of a bar orshank, said bar or shank having at its forward end a tao a. A 1

pered body, said tapered body being provided with a boreextendingtherethrough and reduced at its forward end, a tube extendingthrough said bar or shank and said bore and forming a close fit with thecontracted forward end thereof, a point detachably connected to saidbody and forming a close fit with the tapered end thereof and having infront of such tapered end and offsaid tube a chamber, ports being formedbetween the inner tapered wall of said point and the outer tapered wallof said body, an annular channel with which the said 'ports communicate,and ports extending from said channel and communicating with theenlarged portion of said bore.

5.' In a tool of the character described, the combination of a bar orshank, a tapered point thereon, the said point havin therein a pluralityof passageways extendin longitudinally thereof and in coolin re ation tothe outer tapered surface thereo and connections for circulating fluidthrough said passa eways.

6. na tool of the character described, the combination of a shank orbar, a tapered point carried thereby, said point having a plurality ofpassageways therewithin and extending substantially parallel with theouter tapered surface thereof, the said point having'a chamber initsfront portion with which said passageways communicate, means reraeee:for conducting fluid to such chamber, and a 7, Ina tool of thecharacter described, the

combination of a bar or shank, said bar or shank having at its forwardend a body provided with an external thread and with a frusto-conicalprojection in front of such thread, the said body being provided with abore which is reduced at its forward end, a tube within said bar orshank and fitting closely within the contracted portion of the saidbore, a point having an internal thread cooperating with the thread ofsaid body and having a frusto-conical inner wall adapted to contact withthe frusto-conical wall of said body andprovided with a chamber in frontof said body, the said body being provided with a pluralityof grooves inthe frusto-conical wall thereof and extending longitudinally of suchbodycommunicating at their front ends with said chamber and at their rearends with an annular groove provided in said body at the rear end of thefrusto-conical wall thereof, there being ports extending from saidgroove in-.

wardly to the enlarged portion of saidbore.

8. In a tool of the character described, the combination of a bar orshank, said bar or shank having at its forward end a tapered body, saidtapered body being Iprovided with a bore extending therethroug a pointdetachably connected to said body and form- ,ing a close fit with thetapered end thereof and having a chamber in front of such tapered end,ports bein formed between the inner tapered wall 0 said point and theouter tapered wall of saidbody, and means for circulating a fluidthrough said bore,

' chamber and ports.

9. A tool of the character described having a tapered point provided atits forward end with a rounded knob or projection.

In testimony whereof I hereunto aifix my signature.

LUTHER n. EARL;

